Be patient as the store might be a little more behind than usual. If you dont get them soon(I know some people waited almost 30-40 mins) click Here to make a support ticket if you dont get your keys soon.
Unfortunately you can only claim ranks, creative and parkour titles, voxel sniper and Survival party power with /claim, for issues with purchases like keys and other items, ideally you should just file a support ticket if you haven’t received it within 30 minutes maximum.