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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64237427e1fc46cd90449dbf2d6cb7e2679ff37a01d1de23565130076040ea7f' 
  AND token = 'hWiCAzMrgtDcWAjSn0y9CA24zpuuQQIxxWi7Poljlv4=' 
  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