SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd59517b98abdf0d084971267c11a619c130c2de326487f8390249ec16a750c29' 
  AND token = 'rix9phMp40tvGxLYTJEqWilBTZl9NWuc/iUQoELgfYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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