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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002022773a7e788fcdd86554e96c0ad2023b94234f8fe07a6b79fbcd9459f159' 
  AND token = 'q5ic8raTM+sRbiQqsdphUkE89LJ9sfDfTB7X2EYXxAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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