Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8bd00220f7c7375540568934ef9071f8f9b6bb4f3ffde29d42aae47deed20fc' 
  AND token = 'U4AEVFmUN5ZkFobFozQ+uZ8eEqY2sHfu4vXndLAXVrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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