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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45439043919ab463c98f576f4799a10856c5ea9eb37972f0f01ac1ddf9434955' 
  AND token = 'xrUgRYOn0KSgxsk5qTTc2fDqzjIkFzAb9ApOfQYwDS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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