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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cde8b23a044ddcf3d8e4e42ec0bd2d510ba78cf797dc3fa54136a6fff275f8f' 
  AND token = 'HU+fmwdlhyOp2ZzVKrI6FeyqqA7Y32U39/GtEckUO0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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