SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63750fea300a9a49815f1245680f3a5b109c5654efbcfd24c84cddb37ce70fdb' 
  AND token = 'LZEmIBuSOsFh4fjJ7VIkmBPgNNF5en2qYK95pFZGt0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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