SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b8bdb31fd957da46ef9b028ad02982c6db3bbdd6dcd40890e42f77777208a3' 
  AND token = 'v9ZpIyC/9J2/L+M0SY8KGKA2Cpxs5YhYJYlUPLJSaWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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