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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ddeda9b63d88b390368ddf13e5cae9d7ec33ab7e8916b09beef650a138fb20f' 
  AND token = 'G96QWr0GFRTVs+H9jxhV5T/zrqDp1GEj99Hd6lF8xQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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