You mean like a one-time pad? I'm sure the folks at NIST know about it; it is completely unbreakable and had been around for a while. Use is not really practical though, so typically reserved for very specific use cases.
One time pads fall into the symmetrical encryption category. There is no huge issue with symmetrical encryption with respect to the possibility someone might invent a quantum computer. The things people are working on for a post quantum world and NIST is attempting to standardize are in the asymmetrical encryption category.
This is a silly nitpick. I think its pretty well understood from context i meant a practical quantum safe key agreement algorithm. One time pad cannot be used for that purpose at all, let alone practically.