SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b66325883627d390c21886b852b031d443481162f6ed271937f7a5c2c55b7cc3' 
  AND token = 'i5Qo5wvRwmq/3CnB7GSFxuf3JaTttrwRfuLtZHXNLhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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