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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2545b26e29f180cd35f3119fe876dd1356f65a0a6a9d375d1cf2b509c0b6a3d1' 
  AND token = 'dWM6cajvVKSR1tVCS2Yvm0QzQJ83q3Kz1kyNoYAD1MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

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