SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd27f45bdd7b57e33b486191ca5b6369240174fecd449b97d4f30e4e60a93f7' 
  AND token = 'ZZYX95DPwhrc2FYPqZEx8+E/X8eZEdyuzBntfBQLvVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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