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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e2744dee1f37cf49d3984ebf3faa8b5028912feeac8aea211200b03e87a389' 
  AND token = 'jmJTnICPg7z8FM/3EEponffkqhxJmn40REAQh6dcmxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

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