SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e9726d1cb3ce42459f5aeda3a9b00252e90b8d510ae08946f7c1cb695b2cc1f' 
  AND token = '8d8TSgUXJZtnjocDq1urwz9Wk6KXGKzpqvBIZwabDzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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