SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06aa51d71df733bf84bdbf03a5efaf03e62bece36369cf77f15f551c4f893d7f' 
  AND token = 'b4DPQx5QM9GLzsTAFYBy/YYs1Xz5MzBJuKtNXE7gpzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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