Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83856536eadcced2f6eeb35e8c8915445737bc17ee2a4364286fcab7c0f90154' 
  AND token = 'g2WtKga3MUhB8cpROikbXcIu+YxBp0TOJZWVDH8GC9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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