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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9403e8d54914e6ae25f777d4c52d47837667d51f1f8282bff311e46b31e93b' 
  AND token = 'u5qdqiNb70yYOG9aLZCYrExil2ySCQ8YmdyN7Iqrt+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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