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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31612014bc4cbdd52ae77151ce48fc43954b7e639c8ed0654f26fea36d0fd4cd' 
  AND token = '0ZO0Ly9jxQvqsU2d3rgqfsMZiBh1/7QpJS3bYyG05qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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