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in normal store there is written about region locks on game purchase page

If you look at each of those 2 subs, the global is global, it has no region restrictions. They can be activated and used everywhere, including RU/CIS. So if you are sure you don't have the RU/CIS one, it's safe to put without any region lock.

In some shops, usually they mention region locks (e.g. Fanatical) somewhere. In Fanatical you can see a list of places where it's activated, IIRC. Humble Bundle is harder until you try to activate the key and know how to get the activated sub; if you have a locked one, it should be activable in your region (the one you chose in your user settings).

If you got the key off a bundle, go to Deals and look for the bundle, it'll list the region locks thanks to the busy people there, specially SensualShakti.

I recommend not to contact Humble support about restriction. I did it once before purchasing Hogwarts legacy asking about it saying I have it as prize for contest. They threaten me by ban saying it is only for personal use.

As you live in France(?) afaik you'll get the global key automagically. Besides, if the winner isn't a total jerk he'd consent to delete the GA should any problems materialize.

1. There is no way to know the sub of a key unless you activate it yourself with SteamDB extension (or read the information from F12 Developer Tool). And even doing so won't let you know the sub of a region locked key that excludes your store country.
2. The region lock information is usually written on the store page, but the accuracy varies. Humble Bundle used to gives wrong region information for some bundle keys in the past, but they have been mostly accurate lately. Fanatical does handle region locked key but it is not very clear about it (you need to try selecting from the drop down), and it sometimes give wrong information as well.
3. SteamDB is accurate about the region lock of a sub.
4. SteamDB used to include all sub of an app, but due to change in Steam API, it can no longer see subs that the bot doesn't own. We used to be able to look through the list and determine possible sub of a key, but it's no longer fool proof if publisher decides to make new region locked subs.
5. In the case of WRC 6, if you are buying from Moldova, you might get RU/CIS sub. On the other hand, if you can confirm that your key is global sub, you can gift without restricting country.

Your key region is based on your Steam account region when you first connect to the Humble bundle
In this case: https://steamdb.info/app/458770/subs/
If you're steam region was from RU/CIS when you first connect to the Humble bundle, it's RU/CIS key
If not, you got the global key