The rise in local storage costs and the growth of data have made cloud storage a popular alternative, but it also raises privacy concerns. Public-Key Encryption with Keyword Search (PEKS) addresses these by enabling secure data retrieval without exposing plaintext. With the advent of quantum computing, lattice-based cryptography offers a solution to ensure security against quantum threats. This paper proposes a lattice-based searchable encryption scheme that defends against offline keyword guessing attacks (KGAs) and quantum attacks. A designated test server is used to securely manage search queries. Security analysis based on LWE and SIS assumptions demonstrates the scheme’s quantum resistance. Our scheme outperforms existing solutions in both time and storage efficiency, as demonstrated by experimental results.