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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b28b52a57cf752ccb675c3b3297cd9b5b6bc1dcc57a7a363e3d438cab4b8694' 
  AND token = '5sgbODbyLWvODmKDlFzGdbJj/W6E6jRxwj8fa80w+W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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