SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36466009d92e6f1b2ed53b4540b4b536446e8d93b08f7db0b1eacc97a7467ad3' 
  AND token = 'sOhvdAtfzfQJ5FJE6YPREo8XVVKZ5lLqCdUuvIIkyfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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