SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d832cc2f072fa2b19874055cbfb2f808bbdc4b37b3fa6013b1ac783119a3fec' 
  AND token = 'weZH2S8TbizBoKioAXUqFA/WGLRh79oi3zVmvZTFOY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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