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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d385c8af74444c8e0b1a99ca55d206fa59116a74f2fd6f195f867b4acdb919d' 
  AND token = 'eHU6QGWsLwPPxGUck88sKgb94T2IKdPnzS2fuoMJKtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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