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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78f12b038b65f7ecd0c1fd2c5626c498bee7b1c539645750f173fee49580207d' 
  AND token = 'wNwLxUxc2LLw0ft38GO3eNYQuIRYq8jNUT0CXs10LYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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