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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9897d2a1742b2069d3c82483d6f4c26338c9762bfb42e9f7f8ae2391ab386788' 
  AND token = '1cAZp1NkxPqvzuFyU+ZmsyV31jYj2FIdYUqu4qs2VDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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