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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a38c8e7e90392cdcdfc12992fe8f9e8c84d5654b7e17b09d9f3c02f6f03be4' 
  AND token = '8jdIVcuadbeeJpN16hQXNUFi4oXQ53l4zjVgWqJ6wos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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