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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c5b4e0e37de3e1fd65a05f456ea64ac54abf28b0a0798585ead0cadfcd959c' 
  AND token = 'pGhO3Kh5bs4nQ7eOJYEWSJCd4Abc1djDtnoT0k7dZZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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