SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b467a695097f5c36938862fedc1d2362acefc3756b991149fd8fad423fc5d7' 
  AND token = 'YXGOIOd/7JoRKg+u74RznWpi98rgHClw1CDXU2bj0Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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