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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9f11f406acb2c8227731df9c31634af0be539be23d9dccecd3566d1c562989' 
  AND token = '0ChH9SbrJNJT4Ig2o6hq6hMTsNSf0vu9+qFJeZqs4GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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