SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40995d324da7cb1cd34578c4a93832209b5dfc6787163c5c328f0391feb62bb4' 
  AND token = 'V4uDCj7/s695CE5aX0LAQBi506+h666NzULhIhZWmlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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