Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd52201adb12b5a93f03117b8a8c30fc758d4509689b3b7a58b1decd30333496' 
  AND token = 'x5Cjnx9XkRUsUN34tIqLg9ei0S82beTIhMvt191i1DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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