SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc949a99254197e985aa25fb3c28d0bf426d4fe5646d135ebb30b4988b22746' 
  AND token = 'T+fu6Xkc1nIjvgJEEbKHRL8vvp5EvwZQq9Zl/7nyoLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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