SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e80975947635828ba23b57ef9860d76262e914e0bdbc66de2edf19e6bb06ad9' 
  AND token = 'G5vw8lVOuwUGUWKMLNJ+zlRPyeDeYKhrHxMM39ZDV+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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