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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17ed3bcb75f769a736a8321db7d0fa54fd5416ca91bb2d53540475a8dd6c5c3' 
  AND token = 'GIo4xNWBSMSfZno7zGgUdDljNm2HmmL0motRdee4bfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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