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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6541fc5a6e7a24289fbe2a4827bfcb780524a743b1b3bac75092327e86c668fe' 
  AND token = 'RvlmvVU9NL8rCZ/56N6v9h9ZH5xLWsKSXuTcELItHtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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