SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2aae41e05b69f6e90bcc26378b36c97de478f4d264bc24013b7cb212d1f2f3d' 
  AND token = 'CJ0G5vuFGSU89SJXSvjGzqVvuHLYBSWHXN7CxpVqgqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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