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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09513e267376d3b11ab0710e863d575454ec490d6b4d45cc7391ab9d4e6c2c90' 
  AND token = 'tkG2haQ+Du5YUa4igm384z4fpm+q7TfwZcIW8jS6Dik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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