SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e666236660a3fca81801b843d55194287ded19404e2ff072351c4bfc31c0f34' 
  AND token = 'A2oQ9BmADGRI4ySF6sEhuMoIYeZ9zBPLkoS+wXz+LAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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