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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abfbdc3e9c2d0365b1e6d74ff6ea46a4fc57e73f6c486bda4d8547a8b8905b75' 
  AND token = 'lZ7LoJ6bHre4owTwHFCLD7RYHY6n5A60zjBuQhL7YAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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