SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '065a17b5207e81464459f3413ca4a0fbd64a9a4a78ab7c21aa701db70b529b25' 
  AND token = 'WhGKf82EOgnum58U3rAkYtROTSwLZ6RzL+RvP5/PsuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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