SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2737b115514513148fdc5bb82578679c3ca5f8b3b4f605aa59746d32c07fd9b5' 
  AND token = 'je5lXbROxzb3pB+gwLLi2PS86ehYfiqtUYi+pOvS9yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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