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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1b77dc1deabd493ef8d779ab9a67297eda280239cf6918f7121d81c87ca36d' 
  AND token = 'B9QPrPin74UafKxng07AxOMJ9RaueE3Z/NO/wV43BYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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