Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8b9364817997bc2d9712273ff3243e458c12a06ed806250ae793d684e75a2c' 
  AND token = 'P0frHDTaESMS2LbNsyxVd+jyxEoh0phDAZLjymeaxBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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