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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ebc064fa21e082efd028e477693a5710eee45d0348f5c0cd59df2536a42f0d' 
  AND token = 'Nc3V9pOHFGA4W3292+bFajQHVEiPs15039cHZ/m+3ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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