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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc723848a0f7c24cac2eed4a574971af6c99a66d4cde67059dbe3d34044cbf7' 
  AND token = '8iw5mKvyRcOXUaPIzoEJMrEzZ9RC2uCAguEj4+iBLL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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