SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02fc800fda50518156e87b37c8e8153eadaf9fd683f09b869310b82f4c557a6d' 
  AND token = 'npo3O5YaNmPhUoi6gSFNmIShxNDtRfM2tGzR9jWc0FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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