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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594ee1b65a729ee1185087f8568f4203407f9d94fdfeb35ecd6d2f83f0e0a468' 
  AND token = 'yRK0BZaE4fG9E1ssFob426NoK7TdYtHhCQL3YZ5oddI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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