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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b29a98daadb730b50c932b1b91fa95024d5d8c314d42c0a6be279b07dfd8112' 
  AND token = 'uGjxsmVoZR9Xo6iDlL+ZGRqlxO+Kd7Hgm3SAjWfb1ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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