SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262962590c044dd267eb733e9731c41f4fda6f00bbd17b385d710d4c9e9933a6' 
  AND token = '5HwWuAFCy/BpchsqElRrSaOdPngnD8zI2wGv3Wcv0FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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