SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36058989b8b4af1e341a5ab1e2bf7478454e1c9382c00f7e6c58c4e8c2f3b62' 
  AND token = 'P7VtiXqiTV++jozYBKD0tmKjLmx8MM++kuFaZ/8LKX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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