SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '592af8de0066ffb9546147d74b3077a6ab3c62757bc43d21dc69cf8d463bdd3b' 
  AND token = 'BeyzWGueNDv9Mnn/x/guvvZrxnvif6GzkqyNOG5ljMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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