SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e8ec7f24dc20051f1cbbf25cdd084cfe5e78c29faa79f43ed78760b9438154' 
  AND token = 'tuhOOXwU5PqJ/2KgP5ZxGAP4kX/frKgznFeB8pIDRRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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