I'm looking for a laptop with which you can gamble (only smaller games, now not Cyberpunk), for around 400-450 euro, whether new or used.
A timespy score over 1800 would be nice
There's no such thing as a "gaming" laptop for the price. But you can buy a good office laptop in this price range.
Used from 600 euro or new from 800 euro, there are different models with the GTX 1650 and an i5 or Ryzen 5. That is quite ok to be able to play well in 1080p.
But hey, maybe there's a good laptop for 450 euro on ebay or classifieds, just keep your eyes peeled.