Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c314cfb1e20b7436f2f4a40e75c8be9a11e73d121554b5bd61057cc04c7fe3fc' 
  AND token = 'MD+1f+QDkmgjNxBONUYSssyivRFyjn+2Y4gA0+1Yimk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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