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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8a03bed373b29be9972d7ab44bb6e35e234c9517d0d6f0dc5313b6439d04f7' 
  AND token = 'Y11v5vr7Y4V41AGL59m6rQoawtvZ4suOj8SS0yqf424=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

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