SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd27d829a4e77034acf421596230e003712d7ab9b8095b0ca7fd4adc538f5df81' 
  AND token = 'Xp2bPTK1+kQF/j8Hh6MeM4H1/voyWPYUONExlzXMwlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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