SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d6894dde5f0fb94ea4604860192ed32f7c93e63377e42d5341a4268f0c2297' 
  AND token = 'eY3o2JxTdPnCv2aYhN5ysWfji8eHN+vfJaIk5mTtmO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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