SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059d1f69f01923745226a598c7bd08d03e58b27656cb4f484121119f9fbee2bd' 
  AND token = 'ufWPPzxGSh4kYTW/mUNgLuqM0ZnV968uB9lMT5jhoZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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