SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf09fa986f7b43a8999808fd22d5eec63ca15710913a4825080630f74faf77b' 
  AND token = 'qntzh2pIIhrH2OAxrsxK2gbwsQw3va/KxTGgnWTMYJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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