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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a932d4972faa2197720687bc9a5fb3fa0118bef419a2a5d33709bb310c69d951' 
  AND token = '7WoGIsy0iit14bmfk6lPRdeX+8hEPVmjlFaygu5vurk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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