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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0691ea7e0e892dd6f71e87f6ceaea5c84f88d56a3a19cccec7a730ca8036d723' 
  AND token = 'U33Pm57M0gWgtaCc7XI4LdXusBPAefcYhLbToVVXgps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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