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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1cc7d7402990f60c6a3b1b7c33014f585a27a06d6f81817d215af13119da9b' 
  AND token = 'btv97NQhj7ekF/Jz+8UyLqeZcTamewGcmlbUv6XsGLU=' 
  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