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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08af70afe037e054608068f06501f159eb0228b45a2ea2413c4daca872e6dc96' 
  AND token = 'Bjfg5LAoLZLM1UMQrHf+3TU9b9FxvLBDweMcuqGnaik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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