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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25913df14690e92bc07da8fa262368b402b19bd335e5e48981e5fc162e5865b3' 
  AND token = 'b4w6xBJrfh3b3b6XhFXRnG5GtlyK8BjotxSq8h1Cb1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

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