SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70eebb9a7c7e938d50d0f48a8d394b0358c62129246a90ff58ad8f56365abbdc' 
  AND token = 'xGa+7FrYIJOBm9sR9qmgUo0BGME4NSWHXVBZda97zno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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