SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45bbc96634af987d880ebfd9464ebc13b66c80850b6f869269f9b3ba19dc84ac' 
  AND token = 'BpZJf9wrnQbxHRbX8vhtFkjK/ELmGeYgxp7sA2VOxbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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