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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d1ccf563fd04fa77d688c6aec9575d6fc066e48aecbd3dc7113bbc8d8d37b27' 
  AND token = 'xD57/XEST8brnewBYFbUBwDg5+0C8HHrFhdVlkJvjew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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