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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb3e3bf223652fb2b12d15204a3c0b0046aac47f595c548f4ae428d594a9e9ec' 
  AND token = '373gUbyFpwTtmQ3P5nCNdHyD79A44aLn4mKWfJRn7AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

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