SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ec38be0fd10a6f23e8391b565223cafbcb24e89b82505d76307e056e91854c' 
  AND token = 'hmwq+H3piR9dhnUkgCCGcKJqeOz7k4sCIOaSVU1vAT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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