SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da47e6e7f8b82880401e3131ed7142f6eb3f4a86623db275e29f410c482544d8' 
  AND token = 'ZLVvngKX9uah61d0/ZB2GUqF7/iU3sCltlHG8oBIOl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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