SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632bf940416c832778804103936571c4f246b34eff02c8f36e499cb20afac356' 
  AND token = 'kb2Fv/+tKAqdOGPujs+kUTUOdbALERugLypHmG08DKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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