SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73acbd48d0e4a6cc4357e12e1679857471b8c2bc201775c3a73f68fb7df2d9b8' 
  AND token = 'rRzu8T29FKlPgUTiZGO57Nk1/wxArrVTQOlmhaV0jq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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