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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8bf3ec3127fb18c21a3a780ea666b9d93ede66e7be8b064a11b89dea29e6d7' 
  AND token = '14qn4kL97OB3BPTMt7yENMJmF9jf9rNiySCAybz6VoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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