Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb8db394460ce1fd7005438a0e49160c34019afb53085c900f9a1967e9d9365' 
  AND token = 'kZB9D8bmlx8aNj+YPIdhWbIxl6DihDT3UOpTjS0vAfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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