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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d6364d4523129eadf6d02a3a6501e7108981f636b07bfab99725b7fe2ae457f' 
  AND token = 'hjMEjQqwpcOp20qrvFGttbX7Qu6F2ntoERkJZo7dHK8=' 
  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