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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba6ef27c12b76cd30f4972279705375cc2db5351e13fb09a69a7d63a44a6316' 
  AND token = 'f7NYWbO1EGZp7QPZw70SeS5MWVLmpe2voCUwyb9N+rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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