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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d0014ece11dacbc871ac57199328dfb47d9def29205765e170dfac3e3e8f565' 
  AND token = 'jq6ut9o6BLRctBDeBxhwX5PamCbnQGvaWiCOApyeNBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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