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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a523b3d70b3e71b35c6130da4a449af1f40d25a55e7b5ac9014b67c64a7b8e0' 
  AND token = '6krHq0G6p47cN/6obaK/w+P02DxCgD9X16VznSzNYd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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