SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb8c6f39d8d163d45bae096c4c3e6fe12cff9e5bf8c9a19ec0f7f4a73c3ca9e' 
  AND token = 'CEEKVJ5e9kV0zRfOmTHoFezlBqMsKV7QNA5Pjf6UYAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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