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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33bc3ab8d18eade81bd66743a4176a61de45444061dc16a9097a5b006f87f36' 
  AND token = '7Xfc2OoPesRY14Thte4gVOTDU5kfG2jrZuSqtQpPn3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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