SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719031652742e388649f8cf3d63f564b2ef4ddaa46bb3ed8771a7097affb640f' 
  AND token = 'Dbzlzz+wi1+xG5Sl4AZGgc/aOLzkXvabsZ+EpdrPBzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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