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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fe7ee3b0a252aa40d9c47a6c73fb690554eca7cbed7c9520b8a70f11e89b2b8' 
  AND token = '8CLf8FJPeC845WoSFlcEK8jtNuBLOipA8CoTQHZFTbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables