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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '301cf75863d7ef294753871743f4d0ed02c5ef852524e942d638bad97a25119f' 
  AND token = 'k/wOkuhNZybcCtDt/MBG/uEL24ew/gLQ9oVzsrSMUcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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