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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fbb3685f6cfebcfc40868d202b5d4809ee9c1dda82413d59ede7df8f3a9e82c' 
  AND token = 'K23TwqmVPD5AjNqXzkqBgZ280b6VM9qR0oVpeIHROAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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