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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '448c6a3bfe29ede2aeeeca95275e5bdec80de69d56cde3a6a55d9e75074a31db' 
  AND token = 'IBN1wca4E54cdzD2mjxgYLHhGPs07sUBkc3Xr2ZUjdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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