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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2714fcb248fe390c8ab3d3c92c8e4ae901eb37819cb10f8e9babcdfbbcbccd44' 
  AND token = '5QMBGfAPoBvkSWFFzmaSXCjuJnBMSQIZ9LH0OW9LB7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}