SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809e4b95d5dfd945c24a28107fbad5733ef3a2266d4c79cc2044d9b14ca78925' 
  AND token = 'Ubg7VKVpgFT0clX3UuTMupmNSu8+MzmjnZ6DvENp/qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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