SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13243d81f4d9c62380c1f5cd84ee8ac3180d7bd1b1bba581253801097f7ed90f' 
  AND token = 'xV24cXUaSOTCySYOgqJChm4WFwrOsx/LvxF66z2Gpd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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