SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59485416feef6f992c8122f6c1d3353627039581e5515096f6398592f74fb695' 
  AND token = 'z7TqGAYwwVRH1QTz7b9ts9uI2KrLC++xMZEz0JadP70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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