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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d6dbe794ecb5e47c7012aaa0efd46d8e7192baccec6207445dd8c5372eda7ec' 
  AND token = 'tYh9aVdR8F4tz/unDHXBQ19VFtLs2buct1bVo+mNluk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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