Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec601498dfeeefdba16deaf643c4dedf8b56f799098e0a1c4c5cca1a5928726f' 
  AND token = 'wm3d2/kUZvsrf5K5sSM5PlFyNT1QDHtOAKsLyT5ZNTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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